Mikey, do you have Torque Plates? Are you honing and recrosshatching the cylinders, and fitting the new pistons to the cylinders? I assume so, cause you should be. Do you have what you need to measure the cam end play, which an Evo needs done? If you don't have the tools, you might want to have whomever's doing the work on the barrels install the pistons, rings and barrels, and whatever else you're not tooled for. Just a thought. Don't know your tooling or capabilities at all. But read the SM for Top End Assembly procedure to see what other special things you'll need. 
Thanks !!
Hoist! 
heck no man, I don't have any of the 'SPECIAL' tools required
some of the tools I am 'borrowing', some of them I'm going to get from Auto Zone in their 'free tool loan' program
I'm going to have the cylinders bore .005 over and put 5 over pistons in it
I'm going buy HD 5 over pistons, ship the cylinders and pistons to Bean at Big Boyz
Bean will have the cylinders bored to fit the pistons and will mark the pairs for me
Bean will gap and install the rings on the pistons
I haven't ask him to install the pistons in the cylinders, two reasons (and I MIGHT CHANGE MY MIND)
1) I'm confident that I can do this myself
2) I want to KNOW FOR A FACT that the cylinder is perfectly clean before the pistons go in. If I clean them myself, I'll know for a fact how throughly they were cleaned.
Measure cam end play ..... I have read about this, and know that it needs to be checked, especially in EVOs getting after market cams. I've read several places that for whatever the reason, that aftermarket cams for the EVOs are usually between .030 - .050 shorter than stock, so you have to put a shim stock between the cam and the thrust washer. I am pretty sure that I can do this.